fix(device_remove): close bdev during device removal for spdk bdev

Signed-off-by: Diwakar Sharma <[email protected]>

io-engine/src/bdev/nexus/nexus_bdev_children.rs

@@ -899,6 +899,15 @@ impl<'n> Nexus<'n> {
                         nexus_name,
                         child_device, "Unplugging nexus child device",
                     );
+                    // The child could be open in case of spdk bdev child. Close
+                    // the child here so that the unplug
+                    // correctly identifies the child device
+                    // as destroying. In case of a child fault, we'd reach here
+                    // via retiral path and child must be
+                    // closed already.
+                    if child.is_opened() {
+                        child.close().await.ok();
+                    }
                     child.unplug();
                 }
                 None => {